[master] mention external code using boost license

diff --git a/COPYING b/COPYING
index 557bdfbc219939cad1f537dc77da1b8e369d9198..63717af556a4dbc947835b90190009b20e00ff0b 100644 (file)
--- a/COPYING
+++ b/COPYING
@@ -11,3 +11,9 @@ INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 PERFORMANCE OF THIS SOFTWARE.
+
+-----------------------------------------------------------------------------
+
+The ext/asio and ext/coroutine code is externally maintained and
+distributed under the Boost Software License, Version 1.0.
+(See accompanying file ext/LICENSE_1_0.txt.)